Centrifugal pump.



E. THOMSON. GENTRIFUGAL PUMP.

APPLICATION FILED MAY 2, 1913. l l 1 2 Patented Sept. 29, 1914-;

2 SHEETS-SHEET 1.

R 7 A f a, 45 5 mes: "IF'IX/EHEOFI E. THOMSON,

GENTRIFUGAL PUMP.

APPLIGATIGN FILED MAY 2, 1913. 1 1 12,238 Patented Sept. 29, 1914.

2 $HEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

ELIHU THOMSON, 0F SWAMPSCOTT, MASSACHUSETTS, ASSIGNOR TO GENERAL ELEG" TIE-1C COMPANY, A CORPORATION 01" NEW YORK.

GENTRI UGAL PUMP.

Specification of Letters Patent.

Patented se t. 29, 1914.

Application filed May 2, 1913. Serial No. 765,063.

gal pumps for water or other fluids and: particularly to that type whereina single impeller acts two or more times on the fluid,

so that lby means of a single impeller fluid at a relatively high pressure may be delivered.

For a consideration of what I believe to be novel, and my invention, attention is dirooted to the accompanying specification and the claims appended thereto.

In the-accompanying drawings, which are illustrative ofmy invention, Figure 1 is a vertical section of one form of pump embodying my invention; Fig. 2 is a partial vertical section of the same on another diametrical plane; Fig. 3 is asectional elevation on a plane transverse to Fig. 1, with the impeller removed; Fig.4 is a partial view or the same, with the impeller in place.

Referring to the drawings, power is communicated in any {suitable manner, as for example by means "of the belt 1 and pulley 2, to a shaft 3 suitably journaled in acasing 4 and carrying an impeller, which comprises a web 5 and radial-vanes 6 secured thereto. The sides of the vanes are tapered, and may be provided with shrouds 6 if desired.

These parts are carried on the outer portion of the web, leaving ample openings at the roots of the vanes for the water or other fluid to have access to them. The fluid to be pumped is supplied through a pipe 7 to a chamber 8 at the bottom of the casing,

from which it proceeds through passages 9 to a small chamber 10 around the shaft and feeding said fiui'd to the inner ends of a certain group of vanes. In the interior. of the casing, adjacent to the ends of the vanes, are several chambers and'in the wallsof the casing are curved ducts leading from said chambers to small independent ch'ambers in the-central portion. of the casing, and communicatingwith-the'space at the roots of other groups of the vanes. In the drawings, the ducts are shown as cored out in the material of the casing, their inner sides beingclosed by annular plates 11.

The course of the fluid is from the chamber 10 out through the radial impeller vanes to the lower chamber 12, where it divides into two portions, one passing upthrough the duct 13 to the chamber 14 and the other through the duct 13 to the chamber 14 From these interior chambers 14, 14, it is fed again'to the roots of the vanes and by them thrown radially outward into the next pair of outer chambers 15, 15. From these it proceeds 'by the ducts 16, 16 to another pair-of interior chambers, and soon until finally the two streams of fluid meet in the upper chamber 17 and pass into the delivery pipe 18. The advantage of this arrangement is that the fluid is taken in at the bottom of the pump casing and delivered at the top thereof, so that there is thus the greatest possible separation of the high pressure delivery end from. the low pressure inlet end. It will be observed that in this form of pump, .where'the vanesIare-radial, it is immaterial in which direction the impeller is rotated; that is to say, it may revolve in either direction and will function equally well in both. 1

1' The partitions 19 which separate the ducts fit the impeller as closely as possible, and I i theimpeller also fits the casing very closely,

so. as to prevent leakage between the high and low pressure sides of the. pump. ,The thickness of the inner ends of the partitions should be a little less than the spaces between the vanes,'so as to insure a constant flow of the fluid in a radial direction. It is also preferable to have the vanes break joint with each other in passing the partitions,'so that while one set of vanes is transferring the column offluid in the impeller from one chamber, another set of vanes will be opposite a partition in one angular position and another set will be in still another angular position opposite another partition. In other words, it may be said that it is desirable to have the impellers action with reinner chamber to its corresponding outer backward from the high. pressure end to the inlet. v

In accordance with the provisions of the patent statutes, I have described the principle of operation of my invention, together with the apparatus which I now consider to represent the best embodiment thereof; but I desire to have it'understood that the apparatus shown is only illustrative, and that theinvention can be carried out by other means.

What I claim as new and desire to secure by Letters Eatent of the United States, is,- l." A. centrifugal. pump having a single impeller, means for supplying fluid to the group ofvanes occupying a certain engnlar I position in the casino of said pump, and means for convey ng tile fluld d1sc,lm.r; o ;l by said vanes toa successlonof pairs of groups of vanes ajnnularly displaced from the first group and symmetrically arranged on either side thereof; 1

2 A centrifugal pump having a single impeller provided W1th vanes, a casing haw ing inner Chambers for supplying fluid to the. roots of said. vanes, outer chambers in said casing receivingthe'flnid from the tips win casing in two parallel streams from the inlet to. the outlet.

3. A. centrifugal pump having :1 single impell r p-roviderl with vanes adapted to reboth sides, a casing, an inlet nunirmting with the lower end oi the casing, on onilet conduit at the top of the casing, on chambers and inner chamhe or :5, duets connecting the .low-

.ts connecting each inner chamhu. ii roll the outer eh: mber next in advance, the up} crniost outer chamber communicating with the outlet conduit. whereby the 1 .iiuid will pass around the casing in two parallel siremns.

in whereot l have hereunto set my hand this thirtieth. day of April, 1913.

ELitiU THOMSON.

oMAn Us, Jr.,

amber with the inlet con- 

